500+ mph with the Garmin Nuvi 265WT GPS during flight

We took the Garmin Nuvi 265WT GPS from take off to flight altitude and speed in a Cessna 750th The tracking works great and we saw the device go up to 625 mph, although the video showed only about 500 mph It was fun comparing the nüvi on the in-flight map, because we got to see our flight move through the streets ! However, while the rate was comparable, we noticed that after more than 10,000 feet, the height is not with the in-flight map by up to several thousand meters (25.000 ft). We expect ...



http://www.youtube.com/watch?v=U5ntNXivruk&hl=en

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